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"Schapelle did not confide in Renae Lawrence about any matter relating to her arrest in Indonesia/Bali," the statement read.

"The claims by Renae Lawrence that Schapelle confessed to her that she had knowingly smuggled the marijuana in her boogie board bag are false.

"Schapelle denies ever making any such confession to Renae Lawrence or to anyone else. The further claims by Renae Lawrence that Schapelle had done so on many occasions are preposterous, maliciously false and a creation of her own fantasy."

Lawrence also claims Corby "acted crazy" to get her sentence cut.

In 2012, Indonesian President Susilo Bambang Yudhoyono reduced Corby's sentence by five years, citing compassionate grounds.

"She said it herself, she played crazy so that she would get more sympathy and more time off from the president of Indonesia," Lawrence said.

"She would put on more of an act when someone important came into the block like the doctor or the jail boss."

Corby's parole is already under review after her sister Mercedes gave an interview to the Seven Network, in which she continued to argue her sister's innocence.

Authorities assessing whether Corby should be punished are also taking into account her mental state, after witnessing her attempt at self-harm and assessing her as "unstable".

Head of corrections in Bali, Sunar Agus, said he wouldn't comment on whether the Lawrence interview was an added complication until he had seen it.

But it appears Lawrence may also be in trouble, with prisoners only allowed to give interviews from prison with the permission of the justice ministry.

"The actions of the Ten Network in procuring and presumably paying for this interview, are extremely hurtful and are causing Schapelle and our family great anxiety and distress," the Corby's statement read.

"The credibility of Renae Lawrence should be seriously questioned and unsubstantiated allegations should not be made simply for the sake of ratings and money."

Lawrence was moved from Kerobokan jail to another prison in Bali in October, amid accusations the 36-year-old had conspired with another inmate to murder two female prison guards.

But with good behaviour, she was again moved to a less isolated jail in March.